Dumping body hoist



Feb. 27, 1951 WAGSTAFF 2,543,210

DUMPING BODY HOIST Filed Aug. 9, 1946 3 Sheets-Sheet l FIGI FIGIO INVENTOR {;H 8 E EDWIN M. WAGSTAF'FI BY 28 W W ATTORNEY5 1951 E. M. WAGSTAFF DUMPING BODY HOIST 3 Sheets-Sheet 2 Filed Aug. 9, 1946 INVENTOR inww M. WAGSTAFF kW ATTORNEYS @951 E. M. WAGSTAFF DUMPING BODY HOIST 3 Sheets-Shet 5 Filed Aug. 9, 1946 70656 lOS INVENTOR .l-fflwm MWAGSTAFF ATTORNEY 5 F'atented Feb. 27, 1951 UNITED STATES PATENT OFFICE 2 Claims.

The present invention relates to lifting devices and, more particularly, to hoists, especially for use in connection with vehicles.

It is an object of the invention to provide a hoist which is of a sturdy construction, simple in design, easy to handle and adapted to be used for various purposes.

It is another object of this invention to provide a hoist which can easily be connected with vehicles to facilitate the unloading thereof.

It is also an object of the invention to provide a hoist which can easily be hooked up with trailers or trucks in such a manner as to transform the same into dump trucks.

A still further object of the invention consists in the provision of a hoist as set forth above, which employs a hydraulic medium and can be worked by hand.

These and other objects and advantages of the invention will appear more clearly from the following description in connection with the accompanying drawings, in which:

Figure 1 illustrates a hoist according to the invention as applied to a truck.

Figure 2 shows the arrangement of Figure 1 in operation.

Figure 3 is a view and partially a section along the line 33 of Figure 2.

Figure 4 is a partial section through the hoist according to the invention.

Figure 5 illustrates a possible connection between the vehicle body and the chassis of the "vehicle when the hoist is applied to the body of the vehicle.

Figure 6 shows the detail of Figure 5 seen in the ure 1 for automatically locking the vehicle to and unlocking it from the chassis.

Figure 11 is a section along the line H-T-H of Figure 3.

Figure 12 illustrates a hoist according to the invention being used for pulling poles out of the ground.

General outline In general, the hoist, according to the invention, consists of a fluid operable cylinder piston assembly, one stationary element of which has connected thereto one end of a cable, which passes over a pulley carried by a movable element of said cylinder piston assembly, while the other end of the cable is connected to the object to be lifted. A tank containing fluid as, for instance, oil, is preferably arranged in the immediate vicinity of the cylinder piston. assembly, while a manually operable pump and valve are provided for supplying iluid from the tank into the cylinder piston assembly and allowing the fluid to empty from the fluid piston assembly into the tank.

The arrangement can easily be mounted on a vehicle such as a truck for converting the latter into a dump truck. To this end, one end of the vehicle body, preferably the rear end,'is pivotally connected to the chassis of the vehicle, while the other end of the vehicle body, preferably the front end, is connected to one end of the cable pertaining to the hoist. The hoist itself is mounted on the chassis. Operation of the hoist will then lift the adjacent end of the truck body. When the truck body, after the dumping operation is completed, is returned to its normal position, a locking device preferably locks the truck body to the chassis so that the truck body cannot swing up and down when the truck is moving empty over bumpy roads.

Structural arrangement Referring now to the drawings and Figures 1 and 2 thereof in particular, these figures illustrate a truck, generally designated 29, comprising a chassis 2i and a truck body 22. The truck body 22 has the rear end of its sills 23 connected to a plate 24, for instance, by means of screws 25. This plate is provided with a pivot or stud 26 pivotally mounted in a bearing 2; supported by and connected to the adjacent channel 28 of the chassis. In this way the rear end of the truck body is pivotally connected to the chassis 2 l. The front end of the sills 23 is provided with a rod 29 having clamped thereto, by means of screws 36, a plurality of clamping elements 3i. Pivotally supported by the clamping elements 3i is a yoke or rod 32 with a cranked portion 32a around which one end of a cable or rope 33 is passed. Clamping elements 34 hold the free end of the cable clamped so as to prevent its slipping away from the yoke 32.

The cable 33 is passed over a pulley 35 which is rotatably supported by a tubular or hollow cylindrical element. The tubular member 36 is closed adjacent its upper end by a disc 37 preferably welded to the tubular member 36 and constituting the eifective piston area for the tubuing a slotted plate 42 connected to the bottom of the cylindrical member 36 to limit the maximum upward movement of the cylindrical member 36. As will be seen from Figure '7, the plate 42 is provided with a slot 48 adapted to allow passage of the bent portion 4| therethrough to allow the assembly of the hoist. Once the cylindrical member 36 has been passed over the rod 49, it is rotated by 90 so that it will be. in the position indicated in Figure 7. The cylindrical member 38 has connected thereto, in any convenient manner, for instance, by welding, a sleeve 84 which carries rigidly connected thereto a loop or eyelet forming member 45 through which the other end of the cable 33 is passed. This end is prevented, by clamping member 86, from slipping away from the eyelet 15. Interposed between the tubular member 36 and the sleeve 34 is sealing material 61 compressed by a gland 48. The gland 48 is provided with bosses 49 through which screws 59 pass, which engage similar bosses H on the sleeve 44. The sealing material 8! prevents any leakage of fluid between the tubular member 36 and the hollow cylinder 38. It will be clear that, once the tubular member 36 is assembled in the hollow cylinder 38 in proper position in regard to the latter, and, once the cable 33 has its ends connected to the eyelet 15 and the yoke 32, the tubular member 38 cannot turn relative to the hollow cylinder 38 so that the bent portion ll cannot pass through the longitudinal slot 43.

The ground plate 39 of the cylinder piston assembly 36, 38 is connected, in any convenient manner, for instance, by screws 52, to a supporting plate 53. This plate 53 is provided with eyes a l through which pivots 55 pass which are connected preferably by welding to angles 56. The angles .3 are connected to the channels 28 by means of bolts 51; preferably shims 58 are interposed between the angles 56, and the channels 28. Each of the angles 56 has rigidly connected thereto a bolt 59 which passes, through a slot 8E (see Figure 11) and is surrounded by a spring 9|. The lower end of the spring 5! engages a washer 82 supported by the plate 53, whereas the upper end of the spring 9i engages a washer 63 held in its respective position by a nut 84. It will be clear that the slots Gil allow tilting of the cylinder piston assembly 35, 38 about the pivots 55 without affecting the action of the springs 5| which continuously tend to hold the cylinder piston assembly 36, 38, in upright position.

The lower end of the hollow cylinder 38 is provided with a port 65 which communicates through a conduit 68 with a conduit 8'! (see Fig ure 9). The conduit 61 leads to a check, valve, generally designated 88, comprising a spring 69 which continuously urges a ball 79 to close the port ll. The port ll communicates through a conduit '12 with a cylinder bore 13 having reciprocably mounted therein a plunger Hit The leftward movement of the plunger 14, as viewed in Figure 9, is limited by an adjustable nut 15. The plunger M has a recess 16 engaged by a ballshaped portion of a lever H which lever is provided with a handle l8 to allow manual operation of the plunger '14. The cylinder bore 73 with the plunger Hi constitutes a pump The cylinder bore 73 is provided with a port T9 which communicates through a conduit 80 with a valve generally designated 8|. The valve 8! is provided with a manually operable valve member 82 adapted selectively to effect communication be- 4 tween the conduit and a conduit 83, leading to a check valve 84, or between the conduit 8|] and the conduit 85. The check valve 84 comprises a spring 86 continuously urging a ball 81 into position for closing the valve port 88. The valve port 88 communicates with the conduit which contains an adjustable choke 89. The conduit 85 leads to a tank generally designated 99. This tank or fluid reservoir contains the actuating fluid, such as oil, for operation of the cylinder piston assembly 35, 38. The tank 90 is formed by a portion of the brace 9|, connected to the cylinder 38 by means of a clamping ring 92, and. is also formed by plates 93 and 94.

According to the arrangement shown in Figure 4, the channels 28 have connected thereto hooks 85 (one only being shown), each of which is adapted to engage a stud 96 at the adjacent end of the sills 23. In this way, the hooks will hold the. truck body properly clamped or locked to the chassis when the hoist is not operated for lifting or tilting the truck body.

Operation.

It may now be assumed that the truck body occupies the position shown in Figure 1 and that it is desired to tilt the truck body in order to unload the truck. To this end, the operator detaches the hooks 95 from the studs, 95 and then by operation of the handle 91 moves the valve member 82 into the position shown in Figure 9. Thereupon, the operator moves the handle 18 back and forth, thereby reciprocating, the plunger Hi. By movement of the plunger 14 toward the left, as viewed in Figure 9, a suction is created in the cylinder bore 13 so that fluid from the tank or reservoir 99 will pass through conduit 85, check valve 84, conduit 83 and conduit 80 into the cylinder bore 13. When the plunger Hi now moves toward the right with regard to the showing in Figure 9, the fluid in.the cylinder bore 13 is put under pressure, thereby causing the bore 86 to close its port 88 while the bore 79 opens against the thrust of the spring 69 and allows the fluid to escape from the cylinder bore 13 through conduit 6'! and conduit 66 into the cylinder 38, From the cylinders 38 they fluid passes through the slot 60 into the tubular member 36 and acts upon the disc 3'! and thus begins to lift the tubular member 36 together with the pulley 35. This, in turn, causes lifting of the yoke 32 and thereby also causes, the adjacent end of the truck body to tilt about the pivots 26. Continuing the reciprocation of the plunger 14 will cause the cylindrical member 36 to rise to. a pre-determined maximum height determined by the abutment of thebent portion 41 of the rod 40 against the plate 42, thereby tilting the truck body and unloading the same. While the cylindrical member 36 is being lifted, the cylinder 36 tilts about the pivots 55 as illustrated in Figure 2.

If it is now desired to return the truck body into its Figure '1 position, it is merely necessary to actuate the valvev handle 9'! so as to shift the valve member 82 by 90 in one or the other direction with regard to Figure 9. When the valve member 82 has thus been adjusted, communication between the conduits 80 and 83 is interrupted, while communication is effected between the conduit 85. and the conduit leading from the valve 8| to the conduit, 61. Consequently, the fluid in the cylinder piston assembly 36, 38 can now escape through conduits 66, 61, 98 and. 85 into the tank 90, and is, causedto do so by the weight of the cylindrical member 36 and the weight of the truck body. The rate at which the cylindrical member 36 and, therefore, also the truck body, are turned to their Figure 1 position, is controlled by the adjustable choke 89. When the truck body has completely returned to its Figure 1 position, the hooks 95 may again be actuated for engaging the studs 96.

If desired, the hooks 95 and studs 96 may be replaced by a construction shown in Figure 10. According to this construction, the sills 23 are provided with a socket 99 adapted to be engaged by a bolt 599 when the truck body is in its Figure 1 position. The bolt I00 has connected thereto a piston till reciprocably mounted in a cylinder bore 592. The cylinder bore I02 houses a spring E93 which continuously urges the piston lfll leftwardly as viewed in Figure to thereby cause the bolt E99 to engage the socket 99. The piston ml is provided with an abutment portion I04 limiting the leftward movement of the piston WI. The cylinder bore 192 is provided with a conduit I95 leading to the conduit 61 (see Figure 9). Therefore, as soon as the plunger 14 is actuated for pumping fluid into the cylinder piston assembly 36, 99, fluid from the conduit 61 will also enter the cylinder bore 102, thus causing the plunger ill! to move toward the right with regard to Figure 10, thereby automatically causing the locking bolt to withdraw from the socket 99. The truck body is then free to tilt about the pivots 29 as described above.

While the invention has been described for use in connection with vehicles to convert normal vehicles, such as trucks into dump trucks, it is of course understood that the invention i by no means limited to this particular field. For instance, if desired, the hoist, according to the invention, may be mounted on an independent unit and can be used for pulling posts out of the ground as shown in Figure 12.

It is also understood that the present invention is by no means limited to the particular construction shown in the drawings but also embraces any modifications within the scope of the appended claims.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A hoist comprising in combination, a vehicle including a chassis, cylinder means pivotally connected to said chassis to allow tilting movement of said cylinder means relative to said chassis, a vehicle body, hinge means hinging one end of said vehicle body to said chassis for allowing tilting of said vehicle body relative to said chassis, a yoke tiltably connected to the other end of said vehicle body, plunger means reciprocably mounted in said cylinder means, roller means rotatably supported by said plunger means, cable or rope means passing over said roller means and having one end connected to said cylinder means while the other end of said cable or rope means is connected to said yoke, coil spring means associated with said cylinder means and arranged on one side only of a longitudinal plane of symmetry passing through said cylinder means for continuously urging said cylinder means into its upright position, means associated with said coil spring means for limiting the deflection of said coil spring means, and means for selectively supplying actuating fluid to and exhausting actuating fluid from said cylinder means.

2. In combination, a vehicle including a chassis and a vehicle body, means tiltably connecting one end of said vehicle body with said chassis, yoke means tiltably connected to the other end of said vehicle body, a cylinder hinged to said chassis adjacent said other end of said vehicle body to allow tilting movement of said cylinder relative to said chassis, a plunger reciprocable in said cylinder and being formed of a tubular member open at its bottom and closed at its top, a pulley rotatably mounted on top of said plunger, cable or rope means passing over said pulley and having one end thereof connected to said cylinder while the other end of said cable or rope means is connected to said yoke means, means for selectively supplying actuating fluid to an exhausting actuating fluid from said cylinder, and locking means adapted automatically to lock the vehicle body to the chassis when the vehicle body is in its normal or non-tilted position, said locking means having associated therewith fluid operable means hydraulically connected with said cylinder for hydraulically unlocking said vehicle body from said chassis in response to the admission of actuating fluid to said cylinder.

EDWIN M. WAGSTAFF.

, REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,172,519 Gottschalk Feb. 22, 1916 1,621,075 Larkin Mar. 15, 1927 1,644,785 Lunati Oct. 11, 1927 1,728,460 Weber et a1 Sept. 17, 1929 1,858,797 Wood et al. May 17, 1932 2,234,134 Barrett Mar. 4, 1941 2,366,398 Harrington Jan. 2, 1945 

